Understanding Cat Eye Boogers: Normal Discharge Versus a Problem

In this guide

Almost every cat owner has wiped away a bit of crust from the corner of a cat's eye first thing in the morning. Most of the time this is completely normal, but knowing where the line sits between harmless and worth a vet visit is genuinely useful.

What counts as normal

A small amount of clear or slightly cloudy discharge, especially after a long sleep, is a normal part of a cat's eyes cleaning themselves. Once it dries, it often looks like a small dark crust in the inner corner of the eye, sometimes called eye boogers. As long as your cat is not squinting, pawing at the eye or showing any discomfort, this level of discharge is nothing to worry about and can simply be wiped away with a soft, damp cloth.

When discharge signals a problem

• Discharge that is thick, yellow or green rather than clear
• A noticeable increase in amount, or discharge appearing throughout the day rather than just after waking
• Redness, swelling, or the eye appearing partly closed
• Squinting, excessive blinking, or pawing at the face
• Discharge from only one eye, which often points towards a local issue such as an injury or foreign body

Common causes behind abnormal discharge

Conjunctivitis, often linked to feline herpesvirus, is one of the most common causes of eye discharge that needs treatment. Allergies to pollen, dust or strong household products, bacterial infections, blocked tear ducts, and physical irritants like a stray hair or grass seed are other frequent culprits. Because so many different conditions produce similar looking discharge, a vet examination is really the only reliable way to pin down the cause.

Cleaning your cat's eyes safely

• Use a clean, soft cloth or cotton pad dampened with plain water, one for each eye to avoid spreading anything between them
• Wipe gently from the inner corner outward
• Never use human eye drops, wipes marketed for other purposes, or any product not specifically made for cats

If discharge persists for more than a day or two, changes colour, or comes with any sign of discomfort, book a vet visit rather than waiting it out, since some underlying causes can worsen and affect vision if left untreated.

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